<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    input[name='myusename']{
      background-color: red;
      color: green;
        background-position: ;
    }
  </style>
</head>
<body>
<form>
  <input type="text" name="mypassword" value="000">

  <input type="text" name="myusename" value="admin">
</form>
</body>
</html>